Electronic circuit with single line for control and power supply

摘要

The electric line (L1,2) is used both as control and supply line for an electric consumer appliance (KL). Both potentials of a control voltage (Ub, Gnd) are applied to the electric lines by two switching members (K2a,b) of an electrically controllable instruction switch (K2). The two potentials of a supply voltage (u, v) are switched to the lines by the switching members of the controllable instruction switch, when the latter has been energised. Pref. the controllable instruction switch is a relay, and the switching members contacts.